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While bringing the potential for solving the spectrum underutilization problem using methods such as dynamic and opportunistic spectrum access, Cognitive Radios (CRs) also bring a set of security issues and potential breaches that have to be addressed. These issues come out mainly from the two important capabilities implemented within CRs: their cognition(More)
—In today's wireless networks, there is a great need for quality of service (QoS), because of the time-bounded voice, audio, and video traffic. A new QoS enhanced standard is being standardized by the IEEE 802.11e workgroup. It uses a contention free access mechanism called hybrid control channel access (HCCA) to guarantee QoS. However, HCCA is not(More)
Product or company names used in this set are for identification purposes only. Inclusion of the names of the products or companies does not indicate a claim of ownership by IGI Global of the trademark or registered trademark. Wireless network traffic and quality of service support : trends and standards / Thomas Lagkas, Pantelis Angelidis, and Loukas(More)
A QoS supportive Adaptive Polling (QAP) protocol for wireless LANs is introduced. QAP operates under an infrastructure wireless LAN, where an Access Point (AP) polls the wireless nodes in order to grant them permission to transmit. The polled node sends data directly to the destination node. We consider bursty traffic conditions, under which the protocol(More)
He has been awarded a postdoctoral research scholarship by the State Scholarship Foundation. His interests are in the areas of wireless communication networks, medium access control, QoS provision and mobile multimedia communications with relevant publications at a number of widely recognized international scientific journals and conferences. Cognitive(More)
This study provides field research evidence on the efficiency of a " free-selection " peer review assignment protocol as compared to the typically implemented " assigned-pair " protocol. The study employed 54 sophomore students who were randomly assigned into three groups: Assigned-Pair (AP) (the teacher assigns student works for review to student pairs),(More)